请求取消令牌的任务事件或操作 [英] Task event or action on cancel token requested

问题描述

这是我的代码:

public sealed class ProcessingTask : ProcessingObject
{
    private CancellationTokenSource _cancelToken;    
    private int _timeOut = 10000;

    public int ProcessObjectID { get; private set; }       
    public Task ProcessObjectTask { get; private set; }
    public QueueObject queueObject { private get; set; }
    public ProcessingTask(int processObjectID, Uri url)
        : base(url)
    {           
        this.ProcessObjectID = processObjectID;            
    }

    public void ResetTask()
    {
        _cancelToken = new CancellationTokenSource(_timeOut);            
        ProcessObjectTask = new Task(() => DoTaskWork(), _cancelToken.Token);
    }

    private void DoTaskWork()
    {
        Console.WriteLine("Thread {0} was started...", ProcessObjectID);
        //
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);   // imitate hard process
        HttpWebResponse response = (HttpWebResponse)request.GetResponse(); //  

        response.Dispose();
        //

        // Your logic here
        //queueObject.QueueObjectId - dequeud object is available here
        //
        if (_cancelToken.IsCancellationRequested)
        {
            Console.WriteLine("Thread {0} was timed out...", ProcessObjectID);                
        }
        else
        {
            Console.WriteLine("Thread {0} was finished...", ProcessObjectID);
        }
    }
}

如果 CancellationRequested，我想知道是否存在任何使用事件(或某些操作)的方法.我的意思是我需要在 _timeout 过期的那一刻做 SomeMethod() .任何人都可以解释我:一般有可能吗?

I wonder if exists any way to use event (or some action) if CancellationRequested. I mean that I need to do SomeMethod() exactly in the moment when _timeout Expired. Can anyone explain me: is it possible in general?

推荐答案

您正在寻找 CancellationToken.Register:

You're looking for CancellationToken.Register:

注册将在取消此 CancellationToken 时调用的委托.

Registers a delegate that will be called when this CancellationToken is canceled.

像这样注册一个动作:

_cancelToken.Token.Register(() => DoStuff());

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